Driving mechanism and air door device

ABSTRACT

A driving mechanism and an air door device including the driving mechanism. A switch signal can be switched when a driving gear rotates forward to one position and rotates backward to another position. The driving mechanism comprises the following components in a shell: a switch; a rotary pressing member rotating toward a pressing direction in which a first pressing portion presses the switch and a departure direction in which the first pressing portion departs from the switch; a force application component for driving the rotary pressing member to rotate toward the pressing direction; a driving gear for driving the rotary pressing member to rotate, a motor for driving the driving gear to rotate and a driven gear being engaged with the driving gear are further arranged in the shell, the driving gear is provided with a first abutting portion and a second abutting portion arranged along the circumferential direction.

CROSS REFERENCE TO RELATED APPLICATION

This application claims the benefit of China Application No. 202022204210.6, filed Sep. 30, 2020. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND Field of the Invention

The embodiments of the present invention relates to a driving mechanism and an air door device including the driving mechanism.

Description of the Related Documents

In refrigerators, freezers and the like, air door devices are usually arranged in air flow paths from cold air supply sources to refrigeration spaces to control the amount of cold air sent to the refrigeration spaces.

As the above-mentioned air door device, there is an air door device in the past, which includes a shell and a frame; furthermore, a motor, a gear transmission mechanism, a driving gear and a driven gear are arranged in the shell, the frame is provided with an opening portion, a baffle capable of rotating to open and close the opening portion and connected to the driven gear, and a spring for applying a force to the baffle toward the direction of the driven gear, the rotation output by the motor can be transmitted to the baffle through the gear transmission mechanism, the driving gear and the driven gear in sequence, so that the baffle overcomes the force of the spring to rotate toward the direction of the opening portion; and furthermore, a switch assembly is also arranged in the shell, the switch assembly includes a switch, a rotating rod and a force application component, the rotating rod is provided with a first arm portion and a second arm portion, and is capable of rotating toward a first direction in which the first arm portion presses the switch and toward a second direction in which the first arm portion departs from the switch, the force application component applies a force to the rotating rod to drive the rotating rod to rotate toward the first direction, a cam portion abutting against the second arm portion is arranged on the driving gear, so that the driving gear is driven to rotate with the operation of the motor, and the rotating rod can be driven to rotate by the abutment between the cam portion and the second arm portion, accordingly, the on-off state of the switch can be controlled by using the first arm portion (see Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2018-200773 However, in the above-mentioned air door device, the motor can only rotate toward one direction, if the motor rotates in a reciprocating manner, the driving gear cannot drive the second arm portion to rotate toward the second direction through the abutment between the cam portion and the second arm portion, and thus a switch signal (feedback signal) cannot switched. Furthermore, in the above-mentioned air door device, when the baffle is caused to close the opening portion, the engagement between the driving gear and the driven gear is released, and the spring applies a force to the baffle toward the direction of closing the opening portion. Therefore, a spring component needs to be arranged, resulting in an increase in the cost.

SUMMARY

The embodiment of the present invention is in view of the above-mentioned problems, and to provide a driving mechanism and an air door device including the driving mechanism. A switch signal can be switched when a driving gear rotates forward to one position and rotates backward to another position.

In order to achieve the above-mentioned purpose, the embodiment of the present invention provides a driving mechanism, including a shell, wherein a switch mechanism is arranged in the shell, and the switch mechanism includes: a switch; a rotary pressing member, wherein the rotary pressing member is provided with a first pressing portion and a second pressing portion arranged in the circumferential direction around the rotation axis of the rotary pressing member, and is capable of rotating toward a pressing direction in which the first pressing portion presses the switch and a departure direction in which the first pressing portion departs from the switch; a force application component, wherein the force application component applies a force to the rotary pressing member to drive the rotary pressing member to rotate toward one of the pressing direction and the departure direction; and a driving gear, wherein the driving gear abuts against the second pressing portion to drive the rotary pressing member to rotate, a motor and a driven gear are further arranged in the shell, the driving gear rotates under the driving of the motor, and the driven gear can be engaged with the driving gear, wherein the motor is a bidirectionally rotatable stepping motor, the driving gear is provided with a first abutting portion and a second abutting portion arranged in the circumferential direction around the rotation axis of the driving gear, and is configured to: when the driving gear rotates toward a first direction to a first position, drive the first abutting portion to start to abut against the second pressing portion, so that the rotary pressing member rotates toward the other of the pressing direction and the departure direction, and when the driving gear rotates toward a second direction opposite to the first direction to a second position, drive the second abutting portion to start to abut against the second pressing portion, so that the rotary pressing member rotates toward the other of the pressing direction and the departure direction.

According to the driving mechanism of the embodiment of the present invention, the motor is the bidirectionally rotatable stepping motor that drives the driving gear to rotate, the driving gear is provided with the first abutting portion and the second abutting portion arranged in the circumferential direction around the rotation axis of the driving gear, and is configured to: when rotating toward the first direction to the first position, drive the first abutting portion to start to abut against the second pressing portion, so that the rotary pressing member rotates toward the departure direction (or the pressing direction), and when rotating toward the second direction opposite to the first direction to the second position, drive the second abutting portion to start to abut against the second pressing portion, so that the rotary pressing member rotates toward the departure direction (or the pressing direction). Therefore, the driving gear can be driven by the motor to rotate toward the first direction and the second direction, and when the driving gear rotates toward the first direction to the first position and toward the second direction to the second position, the switch can be switched from an on state (or an off state) to the off state (or the on state), that is, a switch signal can be switched.

In addition, in the switch mechanism of the embodiment of the present invention, preferably, a gear transmission mechanism is further arranged in the shell, the gear transmission mechanism transmits the rotation of the motor to the driving gear, and the driving gear includes: a driving gear shaft portion, wherein the driving gear shaft portion extends along the rotation axis of the driving gear; a first gear portion, wherein the first gear portion is arranged on the driving gear shaft portion in such a manner that the rotation axis of the first gear portion is consistent with the rotation axis of the driving gear, and the first gear portion is engaged with the last stage gear in the gear transmission mechanism; a second gear portion, wherein the second gear portion is arranged on the driving gear shaft portion in such a manner that the rotation axis of the second gear portion is consistent with the rotation axis of the driving gear, and the second gear portion is engaged with the driven gear; a first protrusion portion, wherein the first protrusion portion extends radially outward from the driving gear shaft portion and constitutes the first abutting portion; and a second protrusion portion, wherein the second protrusion portion extends radially outward from the driving gear shaft portion in the circumferential direction in a manner of spacing apart from the first protrusion portion by a gap, and constitutes the second abutting portion.

According to the driving mechanism of the embodiment of the present invention, the driving gear includes: the driving gear shaft portion, wherein the driving gear shaft portion extends along the rotation axis of the driving gear; the first protrusion portion, wherein the first protrusion portion extends radially outward from the driving gear shaft portion and constitutes the first abutting portion; and the second protrusion portion, wherein the second protrusion portion extends radially outward from the driving gear shaft portion and constitutes the second abutting portion. Therefore, there is no need to change the relative position relationship between the main body of the rotary pressing member and the main body of the driving gear, and the first position and the second position can be conveniently changed just by changing the protruding lengths of the first protrusion portion and the second protrusion portion.

In addition, in the switch mechanism of the embodiment of the present invention, preferably, the rotation axis of the rotary pressing member is parallel to the rotation axis of the driving gear, in the case of observation along the rotation axis of the rotary pressing member, when the first abutting portion abuts against the second pressing portion, the angle formed by a connecting line between the action point of a first force applied by the first abutting portion to the second pressing portion and the rotation axis of the rotary pressing member relative to the direction of the first force is 20 degrees to 160 degrees, and/or, when the second abutting portion abuts against the second pressing portion, the angle formed by the connecting line between the action point of a second force applied by the second abutting portion to the second pressing portion and the rotation axis of the rotary pressing member relative to the direction of the second force is 20 degrees to 160 degrees.

According to the driving mechanism of the embodiment of the present invention, the rotation axis of the rotary pressing member is parallel to the rotation axis of the driving gear, in the case of observation along the rotation axis of the rotary pressing member, when the first abutting portion abuts against the second pressing portion, the angle formed by the connecting line between the action point of the first force applied by the first abutting portion to the second pressing portion and the rotation axis of the rotary pressing member relative to the direction of the first force is 20 degrees to 160 degrees, and/or, when the second abutting portion abuts against the second pressing portion, the angle formed by the connecting line between the action point of the second force applied by the second abutting portion to the second pressing portion and the rotation axis of the rotary pressing member relative to the direction of the second force is 20 degrees to 160 degrees. Therefore, the first force and the second force for switching the switch from the on state to the off state may be small.

In addition, in the switch mechanism of the embodiment of the present invention, preferably, the surface of the second pressing portion abutting against the first abutting portion or the second abutting portion is a convex arc surface, and the surface of the first abutting portion and/or the second abutting portion abutting against the second pressing portion includes a concave arc surface.

According to the driving mechanism of the embodiment of the present invention, the surface of the second pressing portion abutting against the first abutting portion or the second abutting portion is the convex arc surface, and the surface of the first abutting portion and/or the second abutting portion abutting against the second pressing portion includes the concave arc surface. Therefore, it is easy to form smooth contact among the first abutting portion, the second abutting portion and the second pressing portion, thereby reducing abrasion and prolonging the service life.

In addition, in the switch mechanism of the embodiment of the present invention, preferably, the rotary pressing member includes: a pressing member shaft portion, wherein the pressing member shaft portion extends along the rotation axis of the rotary pressing member; a first arm portion, wherein the first arm portion extends radially outward from the pressing member shaft portion, and the first pressing portion is arranged at the front end of the first arm portion; and a second arm portion, wherein the second arm portion extends radially outward from the pressing member shaft portion, and the second pressing portion is arranged at the front end of the second arm portion.

In addition, in the switch mechanism of the embodiment of the present invention, preferably, the force application component is a spiral spring arranged coaxially with the rotary pressing member, one end of the spiral spring is clamped in the shell, and the other end of the spiral spring is clamped in the rotary pressing member.

In addition, in order to achieve the above-mentioned purpose, the embodiment of the present invention provides an air door device, including: the driving mechanism of any one of the above items; a frame, wherein the frame is connected to the shell of the driving mechanism and is provided with an opening portion; and a baffle, wherein the baffle is arranged on the frame in a manner of being able to rotate, open and close the opening portion, and is directly or indirectly connected with the driven gear.

In addition, in the air door device of the embodiment of the present invention, preferably, the baffle is provided with an elastic sealing sheet, the elastic sealing sheet is deformed by abutting against the periphery of the opening portion to completely close the opening portion, in the case that the driving gear rotates toward the first direction, the baffle rotates toward the direction of opening the opening portion, in the case that the driving gear rotates toward the second direction, the baffle rotates toward the direction of closing the opening portion, and the engagement between the driving gear and the driven gear is released immediately before the driving gear rotates toward the second direction to the second position.

According to the air door device of the embodiment of the present invention, after the driving gear rotates toward the second direction to a position where the engagement between the driving gear and the driven gear is released, the driving gear rotates idly, and the baffle rotates to a position where the elastic sealing sheet is deformed by abutting against the periphery of the opening portion to completely close the opening portion. Therefore, the baffle can be locked at the closed position through the elasticity of the elastic sealing sheet, so that a spring for keeping the baffle in the state of closing the opening portion can be omitted, and thus the manufacturing cost can be reduced.

The Effect of the Embodiment of the Present Invention

According to the embodiment of the present invention, the motor is the bidirectionally rotatable stepping motor that drives the driving gear to rotate, the driving gear is provided with the first abutting portion and the second abutting portion arranged in the circumferential direction around the rotation axis of the driving gear, and is configured to: when rotating toward the first direction to the first position, drive the first abutting portion to start to abut against the second pressing portion, so that the rotary pressing member rotates toward the departure direction (or the pressing direction), and when rotating toward the second direction opposite to the first direction to the second position, drive the second abutting portion to start to abut against the second pressing portion, so that the rotary pressing member rotates toward the departure direction (or the pressing direction). Therefore, the driving gear can be driven by the motor to rotate toward the first direction and the second direction, and when the driving gear rotates toward the first direction to the first position and toward the second direction to the second position, the switch can be switched from the on state (or the off state) to the off state (or the on state), that is, the switch signal can be switched.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional diagram schematically showing an air door device according to the embodiment of the present invention, wherein a part of a shell is omitted.

FIG. 2 is a side view schematically showing the air door device according to the embodiment of the present invention, wherein a part of the shell is omitted, and the state when a baffle rotates to a first position is shown.

FIG. 3 is a partial side view schematically showing the air door device according to the embodiment of the present invention, and showing the state when the baffle rotates to the first position.

FIG. 4 is a side view schematically showing the air door device according to the embodiment of the present invention, wherein a part of the shell is omitted, and the state when the baffle rotates to a second position is shown.

FIG. 5 is a partial side view schematically showing the air door device according to the embodiment of the present invention, and showing the state when the baffle rotates to the second position.

FIG. 6 is a timing diagram schematically showing the relationship among the driving of a motor of the air door device, the action of the baffle and a switch signal according to the embodiment of the present invention, wherein the solid line represents an on-off signal of the switch, and the dashed line represents the rotation angle of the baffle.

FIG. 7 is a partial side view schematically showing a modification embodiment of the air door device of the embodiment of the present invention, and showing the state when the baffle rotates to the first position.

FIG. 8 is a partial side view schematically showing a modification embodiment of the air door device of the embodiment of the present invention, and showing the state when the baffle rotates to the second position.

DETAILED DESCRIPTION

Hereinafter, the air door device according to the embodiment of the present invention will be described in combination with FIG. 1 to FIG. 6.

Here, for the convenience of description, three directions orthogonal to each other are set as an X direction, a Y direction and a Z direction, further, one side of the X direction is set as X1, the other side of the X direction is set as X2, one side of the Y direction is set as Y1, the other side of the Y direction is set as Y2, one side of the Z direction is set as Z1, the other side of the Z direction is set as Z2, and the extension of the rotation axis of a baffle is set to be consistent with the X direction.

(The Overall Structure of the Air Door Device)

As shown in FIG. 1, FIG. 3 and FIG. 5, the air door device 1 includes: a driving mechanism 10, and the driving mechanism 10 includes: a shell 11; a frame 20, wherein the frame 20 is connected to the shell 11 of the driving mechanism 10 and is provided with an opening portion (not shown); and a baffle 30, wherein the baffle 30 is arranged on the frame 20 in a manner of being able to rotate, open and close the opening portion, and is driven by the driving mechanism 10.

(Structure on the Driving Mechanism Side)

As shown in FIG. 1 to FIG. 5, a switch mechanism 12 is arranged in the shell 11 of the driving mechanism 10, and the switch mechanism 12 includes: a switch 121 (it is a button switch in the shown example); a rotary pressing member 122, wherein the rotary pressing member 122 is provided with a first pressing portion 1223 and a second pressing portion 1224 arranged in the circumferential direction around the rotation axis of the rotary pressing member 122, and is capable of rotating toward a pressing direction (a clockwise direction in FIG. 2) in which the first pressing portion 1223 presses the switch 121 and a departure direction (a counterclockwise direction in FIG. 2) in which the first pressing portion 1223 departs from the switch 121; a force application component 123, wherein the force application component 123 applies a force to the rotary pressing member 122 to drive the rotary pressing member 122 to rotate toward one of the pressing direction and the departure direction (in the shown example, the force application component 123 applies a force to the rotary pressing member 122 to drive the rotary pressing member 122 to rotate toward the pressing direction); and a driving gear 127, wherein the driving gear 127 abuts against the second pressing portion 1224 to drive the rotary pressing member 122 to rotate. Furthermore, a motor 124 and a driven gear 128 are further arranged in the shell 11, the driving gear 127 rotates under the driving of the motor 124, and the driven gear 128 can be engaged with the driving gear 127.

In addition, as shown in FIG. 1 to FIG. 5, the motor 124 is a bidirectionally rotatable stepping motor, the driving gear 127 is provided with a first abutting portion 1273 and a second abutting portion 1274 arranged in the circumferential direction around the rotation axis of the driving gear 127, and is configured to: when the driving gear 127 rotates toward a first direction (the clockwise direction in FIG. 2) to a first position (the position shown in FIG. 2 and FIG. 3), drive the first abutting portion 1273 to start to abut against the second pressing portion 1224, so that the rotary pressing member 122 rotates toward the other of the pressing direction and the departure direction (in the shown example, the rotary pressing member 122 rotates toward the departure direction), and when the driving gear 127 rotates toward a second direction (the counterclockwise direction in FIG. 2) opposite to the first direction to a second position (the position shown in FIG. 4 and FIG. 5), drive the second abutting portion 1274 to start to abut against the second pressing portion 1224, so that the rotary pressing member 122 rotates toward the other of the pressing direction and the departure direction (in the shown example, the rotary pressing member 122 rotates toward the departure direction).

Here, as shown in FIG. 1, FIG. 2 and FIG. 4, the shell 11 is approximately cuboid, and is provided with a shell bottom wall 111, a top wall (not shown) opposite to the shell bottom wall 111, and side walls (part of which is not shown) vertically extending from the periphery of the shell bottom wall 111 to the top wall, wherein the shell bottom wall 111 and the top wall are opposite to each other at an interval in the X direction, the side walls include a pair of opposite side walls in the Y direction and a pair of opposite side walls in the Z direction (in the shown example, the shell 11 includes a first shell and a second shell that are assembled together along the X direction through a clamping structure, but it is not limited thereto).

In addition, as shown in FIG. 1, FIG. 3 and FIG. 5, a gear transmission mechanism 125 is further arranged in the shell 11, and the gear transmission mechanism 125 transmits the rotation of the motor 124 to the driving gear 127. Specifically, the motor 124 is, for example, fixed on the shell bottom wall 111 and is provided with an output shaft (not shown, extending along the X direction in the figures), and a pinion (not shown) is arranged on the output shaft; the gear transmission mechanism 125 includes a first compound gear 1251 and a second compound gear 1252, wherein the first compound gear 1251 is rotatably supported on the shell 11 through a fulcrum shaft (extending along the X direction in the figures), and is provided with a large-diameter gear portion 1251A engaged with the pinion on the output shaft of the motor 124 and a small-diameter gear portion 1251B arranged coaxially with the large-diameter gear portion 1251A, and the second compound gear 1252 is rotatably supported on the shell 11 through a fulcrum shaft, and is provided with a small-diameter gear portion 1252A engaged with the small-diameter gear portion 1251B of the first compound gear 1251 and a large-diameter gear portion 1252B arranged coaxially with the small-diameter gear portion 1252A; further, the driving gear 127 includes: a driving gear shaft portion 1270, wherein the driving gear shaft portion 1270 extends along the rotation axis of the driving gear 127 (in the shown example, the rotation axis of the driving gear 127 extends parallel to the X direction); a first gear portion 1271, wherein the first gear portion 1271 is arranged on the driving gear shaft portion 1270 in such a manner that the rotation axis of the first gear portion is consistent with the rotation axis of the driving gear 127, and the first gear portion is engaged with the last stage gear in the gear transmission mechanism 125 (it is the second compound gear 1252 in the shown example); a second gear portion (not shown), wherein the second gear portion is arranged on the driving gear shaft portion 1270 in such a manner that the rotation axis of the second gear portion is consistent with the rotation axis of the driving gear 127 (in the shown example, the second gear portion is arranged on the X direction side of the first gear portion 1271), and the second gear portion is engaged with the driven gear 128; a first protrusion portion, wherein the first protrusion portion extends radially outward from the driving gear shaft portion 1270 and constitutes the first abutting portion 1273; and a second protrusion portion, wherein the second protrusion portion extends radially outward from the driving gear shaft portion 1270, and constitutes the second abutting portion 1274.

In addition, as shown in FIGS. 1 to 5, the rotary pressing member 122 includes: a pressing member shaft portion 1220, wherein the pressing member shaft portion 1220 extends along the rotation axis of the rotary pressing member 122 (in the shown example, the rotation axis of the rotary pressing member 122 extends parallel to the X direction); a first arm portion 1221, wherein the first arm portion 1221 extends radially outward from the pressing member shaft portion 1220, and the first pressing portion 1223 is arranged at the front end of the first arm portion 1221; and a second arm portion 1222, wherein the second arm portion 1222 extends radially outward from the pressing member shaft portion 1220, and the second pressing portion 1224 is arranged at the front end of the second arm portion. Further, the surface of the second pressing portion 1224 abutting against the first abutting portion 1273 or the second abutting portion 1274 is a convex arc surface (in the shown example, when being observe along the X direction, the first pressing portion 1223 and the second pressing portion 1224 are both approximately circular).

In addition, as shown in FIG. 1, FIG. 3 and FIG. 5, the rotation axis of the rotary pressing member 122 is parallel to the rotation axis of the driving gear 127, in the case of observation along the rotation axis of the rotary pressing member 122, when the first abutting portion 1273 abuts against the second pressing portion 1224, the angle formed by a connecting line LN1 between the action point of a first force F1 applied by the first abutting portion 1273 to the second pressing portion 1224 and the rotation axis of the rotary pressing member 122 relative to the direction of the first force F1 is 20 degrees to 160 degrees, and/or, when the second abutting portion 1274 abuts against the second pressing portion 1224, the angle formed by the connecting line LN2 between the action point of a second force F2 applied by the second abutting portion 1274 to the second pressing portion 1224 and the rotation axis of the rotary pressing member 122 relative to the direction of the second force F2 is 20 degrees to 160 degrees. Further, the surface of the first abutting portion 1273 and/or the second abutting portion 1274 abutting against the second pressing portion 1224 includes a concave arc surface (in the shown example, when being observed along the X direction, the first abutting portion 1273 has a substantially fan shape in which the corner between the outer circumferential surface and one side face in the circumferential direction is cut to form the concave arc surface, and the second pressing portion 1224 has a substantially fan shape).

In addition, as shown in FIGS. 1 to 5, the force application component 123 is a spiral spring arranged coaxially with the rotary pressing member 122, one end of the spiral spring is directly or indirectly clamped in the shell 11, and the other end of the spiral spring is clamped in the rotary pressing member 122.

In addition, as shown in FIGS. 1 to 5, the driving gear 127 is rotatably supported on the shell 11 through a fulcrum shaft (extending along the X direction in the shown example), in the driving gear 127, the first gear portion 1271 is a sector gear, and the second gear portion is also a sector gear; and furthermore, the driven gear 128 is rotatably supported on the shell 11 through a fulcrum shaft (extending along the X direction in the shown example), and is a sector gear.

(Structure on the Frame Side)

As shown in FIG. 1, the frame 20 approximately takes the shape of a rectangular frame, the frame is provided with frame side walls 211 opposite to the shell bottom wall 111 of the shell 11 in the X direction at intervals, and a frame bottom wall (not shown) for connecting the frame side walls 211 with the shell bottom wall 111, and respectively connecting a pair of opposite frame side walls in the Y direction and the periphery with the three frame side walls and the shell bottom wall 111, and the above-mentioned opening portion is arranged on the frame bottom wall.

In addition, for example, the both ends of the baffle 30 in the length direction (the direction consistent with the X direction in the shown example) are respectively provided with pivot shafts (not shown) that are rotatably supported by the shell bottom wall 111 and the frame side walls 211, wherein one of the pivot shafts penetrates through the shell bottom wall 111 to be connected with the driven gear 128; and, although not shown, the baffle 30 is provided with an elastic sealing sheet, which abuts against the periphery of the opening portion when the baffle 30 closes the opening portion.

In addition, as shown in FIG. 2 to FIG. 5, when the driving gear 127 rotates toward the first direction (the clockwise direction in FIG. 2) to the first position (the position shown in FIG. 2 and FIG. 3), the baffle 30 rotates the maximum angle or is about to rotate the maximum angle toward the direction of opening the opening portion, when the driving gear 127 rotates toward the second direction (the counterclockwise direction in FIG. 4) to the second position (the position shown in FIG. 4 and FIG. 5), the baffle 30 rotates toward the direction of closing the opening portion to a position where the elastic sealing sheet is deformed by abutting against the periphery of the opening portion to completely close the opening portion, furthermore, the driving gear 127 is engaged with the driven gear 128 in an interval where the driving gear 127 rotates from the first position to a position before closely adjacent to the second position (the interval is an angle range of about 90 degrees in the shown example), and the engagement between the driving gear 127 and the driven gear 128 is released before the driving gear 127 is about to rotating toward the second direction to the second position.

(The Relationship Among the Driving of the Motor, the Movement of the Baffle and the Switch Signal)

Referring to FIG. 6 (wherein the horizontal axis represents the number of driving steps of the motor, and the vertical axis represents the rotation angle of the baffle), it is taken as an example for illustration that the baffle 30 rotates from the position of closing the opening portion of the frame 20 to the position of completely opening the opening portion of the frame 20.

As shown in FIG. 6, in a state when the motor 124 is not driven, the baffle 30 is at the position of closing the opening portion of the frame 20, and the switch 121 is in an off state.

Then, at the moment when the motor 124 drives 250 steps (referring to a point cc in FIG. 6), the on-off state of the switch 121 is switched (specifically, is switched from the off state to the on state), but the baffle 30 is still at the position of closing the opening portion of the frame 20.

Then, at the moment when the motor 124 drives more than 400 steps, the baffle 30 starts to rotate to gradually open the opening portion of the frame 20.

Then, at the moment when the motor 124 drives 1500 steps, the on-off state of the switch 121 is switched again (specifically, is switched from the on state to the off state).

Finally, at the moment when the motor 124 drives 1800 steps (referring to a point op in FIG. 6), the baffle 30 reaches the position of completely opening the opening portion of the frame 20 (the position where the baffle 30 rotates the maximum angle toward the direction of opening the opening portion of the frame 20).

Main Effects of this Embodiment

According to the air door device 1 of this embodiment, the motor 124 is the bidirectionally rotatable stepping motor that drives the driving gear 127 to rotate, the driving gear 127 is provided with the first abutting portion 1273 and the second abutting portion 1274 arranged in the circumferential direction around the rotation axis of the driving gear 127, and is configured to: when rotating toward the first direction to the first position, drive the first abutting portion 1273 to start to abut against the second pressing portion 1224, so that the rotary pressing member 122 rotates toward the departure direction (or the pressing direction), and when rotating toward the second direction opposite to the first direction to the second position, drive the second abutting portion 1274 to start to abut against the second pressing portion 1224, so that the rotary pressing member 122 rotates toward the departure direction (or the pressing direction). Therefore, the driving gear 127 can be driven by the motor 124 to rotate toward the first direction and the second direction, and when the driving gear 127 rotates toward the first direction to the first position and toward the second direction to the second position, the switch 121 can be switched from the on state (or the off state) to the off state (or the on state), that is, the switch signal can be switched. The embodiment of the present invention is exemplarily described above in conjunction with the drawings. Obviously, the specific implementation of the embodiment of the present invention is not limited by the above-mentioned embodiment.

For example, in the above-mentioned embodiment, the gear transmission mechanism 125 is further arranged in the shell 11, the gear transmission mechanism 125 transmits the rotation of the motor 124 to the driving gear 127, but it is not limited thereto, and the gear transmission mechanism 125 can also be omitted according to the situation.

In addition, in the above-mentioned embodiment, the shapes of the first abutting portion 1273 and the second abutting portion 1274 of the driving gear 127, and the first pressing portion 1223 and the second pressing portion 1224 of the rotary pressing member 122 can be changed properly as needed. For example, they can be formed into the shapes shown in FIG. 7 and FIG. 8. In addition, in the above-mentioned embodiment, the rotation axis of the rotary pressing member 122 is parallel to the rotation axis of the driving gear 127, but it is not limited thereto, and it can also be set such that the rotation axis of the rotary pressing member 122 is not parallel to the rotation axis of the driving gear 127.

In addition, in the above-mentioned embodiment, the driving gear 127 is engaged with the driven gear 128 in the interval where the driving gear 127 rotates from the first position to the position before closely adjacent to the second position, the engagement between the driving gear 127 and the driven gear 128 is released before the driving gear 127 is about to rotating toward the second direction to the second position, but it is not limited thereto, for example, it can also be set such that the engagement between the driving gear 127 and the driven gear 128 is released when the driving gear 127 rotates toward the second direction to the second position.

In addition, in the above-mentioned embodiment, the force application component 123 is the spiral spring arranged coaxially with the rotary pressing member 122, but it is not limited thereto, and a plate spring or the like can be provided instead of the spiral spring.

It should be understood that within the scope of the embodiment of the present invention, various parts in the embodiment can be freely combined, or various parts in the embodiment can be appropriately deformed or omitted. 

What is claimed is:
 1. A driving mechanism, comprising a shell, wherein a switch mechanism is arranged in the shell, and the switch mechanism comprises: a switch; a rotary pressing member, wherein the rotary pressing member is provided with a first pressing portion and a second pressing portion arranged in the circumferential direction around the rotation axis of the rotary pressing member, and is capable of rotating toward a pressing direction in which the first pressing portion presses the switch and a departure direction in which the first pressing portion departs from the switch; a force application component, wherein the force application component applies a force to the rotary pressing member to drive the rotary pressing member to rotate toward one of the pressing direction and the departure direction; and a driving gear, wherein the driving gear abuts against the second pressing portion to drive the rotary pressing member to rotate, a motor and a driven gear are further arranged in the shell, the driving gear rotates under the driving of the motor, and the driven gear can be engaged with the driving gear, wherein, the motor is a bidirectionally rotatable stepping motor, the driving gear is provided with a first abutting portion and a second abutting portion arranged in the circumferential direction around the rotation axis of the driving gear, and is configured to: when the driving gear rotates toward a first direction to a first position, drive the first abutting portion to start to abut against the second pressing portion, so that the rotary pressing member rotates toward the other of the pressing direction and the departure direction, and when the driving gear rotates toward a second direction opposite to the first direction to a second position, drive the second abutting portion to start to abut against the second pressing portion, so that the rotary pressing member rotates toward the other of the pressing direction and the departure direction.
 2. The driving mechanism of claim 1, wherein, a gear transmission mechanism is further arranged in the shell, the gear transmission mechanism transmits the rotation of the motor to the driving gear, and the driving gear comprises: a driving gear shaft portion, wherein the driving gear shaft portion extends along the rotation axis of the driving gear; a first gear portion, wherein the first gear portion is arranged on the driving gear shaft portion in such a manner that the rotation axis of the first gear portion is consistent with the rotation axis of the driving gear, and the first gear portion is engaged with the last stage gear in the gear transmission mechanism; a second gear portion, wherein the second gear portion is arranged on the driving gear shaft portion in such a manner that the rotation axis of the second gear portion is consistent with the rotation axis of the driving gear, and the second gear portion is engaged with the driven gear; a first protrusion portion, wherein the first protrusion portion extends radially outward from the driving gear shaft portion and constitutes the first abutting portion; and a second protrusion portion, wherein the second protrusion portion extends radially outward from the driving gear shaft portion in the circumferential direction in a manner of spacing apart from the first protrusion portion by a gap, and constitutes the second abutting portion.
 3. The driving mechanism of claim 1, wherein, the rotation axis of the rotary pressing member is parallel to the rotation axis of the driving gear, in the case of observation along the rotation axis of the rotary pressing member, when the first abutting portion abuts against the second pressing portion, the angle formed by a connecting line between the action point of a first force applied by the first abutting portion to the second pressing portion and the rotation axis of the rotary pressing member relative to the direction of the first force is 20 degrees to 160 degrees, and/or, when the second abutting portion abuts against the second pressing portion, the angle formed by the connecting line between the action point of a second force applied by the second abutting portion to the second pressing portion and the rotation axis of the rotary pressing member relative to the direction of the second force is 20 degrees to 160 degrees.
 4. The driving mechanism of claim 1, wherein, the surface of the second pressing portion abutting against the first abutting portion or the second abutting portion is a convex arc surface, and the surface of the first abutting portion and/or the second abutting portion abutting against the second pressing portion comprises a concave arc surface.
 5. The driving mechanism of claim 1, wherein, the rotary pressing member comprises: a pressing member shaft portion, wherein the pressing member shaft portion extends along the rotation axis of the rotary pressing member; a first arm portion, wherein the first arm portion extends radially outward from the pressing member shaft portion, and the first pressing portion is arranged at the front end of the first arm portion; and a second arm portion, wherein the second arm portion extends radially outward from the pressing member shaft portion, and the second pressing portion is arranged at the front end of the second arm portion.
 6. The driving mechanism of claim 1, wherein, the force application component is a spiral spring arranged coaxially with the rotary pressing member, one end of the spiral spring is clamped in the shell, and the other end of the spiral spring is clamped in the rotary pressing member.
 7. An air door device, comprising: the driving mechanism of claim 1; a frame, wherein the frame is connected to the shell of the driving mechanism and is provided with an opening portion; and a baffle, wherein the baffle is arranged on the frame in a manner of being able to rotate, open and close the opening portion, and is directly or indirectly connected with the driven gear.
 8. The air door device of claim 7, wherein, the baffle is provided with an elastic sealing sheet, the elastic sealing sheet is deformed by abutting against the periphery of the opening portion to completely close the opening portion, in the case that the driving gear rotates toward the first direction, the baffle rotates toward the direction of opening the opening portion, in the case that the driving gear rotates toward the second direction, the baffle rotates toward the direction of closing the opening portion, and the engagement between the driving gear and the driven gear is released immediately before the driving gear rotates toward the second direction to the second position.
 9. An air door device of claim 7, wherein, a gear transmission mechanism is further arranged in the shell, the gear transmission mechanism transmits the rotation of the motor to the driving gear, and the driving gear comprises: a driving gear shaft portion, wherein the driving gear shaft portion extends along the rotation axis of the driving gear; a first gear portion, wherein the first gear portion is arranged on the driving gear shaft portion in such a manner that the rotation axis of the first gear portion is consistent with the rotation axis of the driving gear, and the first gear portion is engaged with the last stage gear in the gear transmission mechanism; a second gear portion, wherein the second gear portion is arranged on the driving gear shaft portion in such a manner that the rotation axis of the second gear portion is consistent with the rotation axis of the driving gear, and the second gear portion is engaged with the driven gear; a first protrusion portion, wherein the first protrusion portion extends radially outward from the driving gear shaft portion and constitutes the first abutting portion; and a second protrusion portion, wherein the second protrusion portion extends radially outward from the driving gear shaft portion in the circumferential direction in a manner of spacing apart from the first protrusion portion by a gap, and constitutes the second abutting portion.
 10. An air door device of claim 7, wherein, the rotation axis of the rotary pressing member is parallel to the rotation axis of the driving gear, in the case of observation along the rotation axis of the rotary pressing member, when the first abutting portion abuts against the second pressing portion, the angle formed by a connecting line between the action point of a first force applied by the first abutting portion to the second pressing portion and the rotation axis of the rotary pressing member relative to the direction of the first force is 20 degrees to 160 degrees, and/or, when the second abutting portion abuts against the second pressing portion, the angle formed by the connecting line between the action point of a second force applied by the second abutting portion to the second pressing portion and the rotation axis of the rotary pressing member relative to the direction of the second force is 20 degrees to 160 degrees.
 11. An air door device of claim 7, wherein, the surface of the second pressing portion abutting against the first abutting portion or the second abutting portion is a convex arc surface, and the surface of the first abutting portion and/or the second abutting portion abutting against the second pressing portion comprises a concave arc surface.
 12. An air door device of claim 7, wherein, the rotary pressing member comprises: a pressing member shaft portion, wherein the pressing member shaft portion extends along the rotation axis of the rotary pressing member; a first arm portion, wherein the first arm portion extends radially outward from the pressing member shaft portion, and the first pressing portion is arranged at the front end of the first arm portion; and a second arm portion, wherein the second arm portion extends radially outward from the pressing member shaft portion, and the second pressing portion is arranged at the front end of the second arm portion.
 13. An air door device of claim 7, wherein, the force application component is a spiral spring arranged coaxially with the rotary pressing member, one end of the spiral spring is clamped in the shell, and the other end of the spiral spring is clamped in the rotary pressing member. 